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Diamonds

 

Blemish

The degree to which a diamond is free from inclusions, graded on a scale from Flawless to I3. There are 12 grades in total .

 
Brilliance Along with life, sparkle, scintillation, refraction and dispersion, a word used to describe the reflective and refractive properties of a diamond.
 
Carat Standard unit of measure for diamonds and other gemstones. One carat is equal to 1/5 of a gram, or 2 grams, or 100 points.
 
Clarity The degree to which a diamond is free from inclusions, graded on a scale from Internally Flawless to Included.
 
Clarity Enhancement See "drilling" and "fracture filling".
 
Cleavage

An internal imperfection which runs in the direction of the grain of the diamond. It sometimes extends to the surface of the diamond, or is "healed" inside the diamond .

 
Cloud

A cluster of microscopic white or crystalline inclusions or pinpoints inside a diamond .

 
Colour

The best colour is no color or "colourless". Most diamonds have some greater or lesser degree of yellow or brown colour, sometimes so slight that it is virtually imperceptible. Some rare diamonds have very intense or exotic colours (pink, blue, green, purple, or even red) and can be extraordinarily valuable .

 
Colour Enhancement

Laboratory processes ranging from a simple coating or "painting" as it is known in the trade to sophisticated permanent alteration of the presence of certain trace elements found in the naturally occurring diamond. Laboratory certification is your best protection against treated stones.

 
Cutlet

The bottom most facet or point of a diamond. The cutlet of some round diamonds may be so pointed they are considered to not be a facet at all .

 
Cut

Cut refers to two main aspects, first: the shape of the stone i.e., emerald cut, princess cut etc. second, the proportions and dimensions of a diamond also known as "make".

 
Depth The distance between the cutlet (bottom) and the table (top) of the diamond, measured in millimeters. Given as a percentage of the average diameter of a diamond.
 
Depth % The depth of the diamond divided by the average width.
 
Drilling A man-made enhancement process in which a laser is used to drill to the inside of a diamond to an inclusion, which is then bleached to appear white. 
 
Eye-clean Free of any internal inclusions or external blemishes to the naked eye, when viewed from the top.
 
Facets The polished planes (surfaces) on the surface of the diamond, defining its dimensions.
 
Feather

A common naturally occurring white feather shaped inclusion, which is not visible to the naked eye .

 
Fire Along with life, sparkle, scintillation, refraction, dispersion a word used to describe the brilliance of a diamond.
 
Fluorescence

Also known as photoluminescence, the property some diamonds have that makes them glow a certain colour (usually blue) when placed in an ultraviolet rich environment. Strong, very strong and sometimes medium blue fluorescence may slightly improve the colour appearance of diamonds rated "H" in colour or below (I,J,K etc). Such fluorescence in some of the "lower" colours may even enhance the value of these stones. Strong blue fluorescence in diamonds D to F colour may impart a very slightly bluish appearance and may, in turn, detract a few percent from the value of those diamonds. Some diamonds with strong blue fluorescence can have a hazy or "milky" appearance. 

 
Fracture

An internal or external imperfection which may have developed 

 
Fracture Filling

A man-made enhancement process in which an inclusion is injected with filler material to mask the presence of it. .

 
GIA

Gemological Institute of America, the single most widely international accepted diamond authority. An independent, third-party international grading service offering diamond grading certificates .

 
Girdle The outermost edge of a diamond, it can be unpolished, polished, or faceted. Usually where the diamond is held in a setting.
 
I1

A term used to describe the clarity of the diamond, meaning Included. There are three grades in the I range: I1, I2 and I3.

 
IF

Internally flawless. Free of any internal imperfections at 10 power magnification .

 
Inclusion A naturally occurring imperfection often referred to as a feather, pinpoint or cloud in the diamond that may or may not be visible to the naked eye.
 
Make The proportions and dimensions of a diamond, also known as cut.
 
Melee Diamonds which weigh less than 1/5 of a carat (20 points) are known as melee. They are usually side diamonds or accent diamonds in a larger piece of jewelry.
 
Natural An external characteristic on or near a diamond's girdle, a natural is actually an unpolished portion of the "skin" of the rough diamond.
 
Pavillion The faceted portion of the diamond which is below the girdle.
 
Pinpoint A very small inclusion inside a diamond.
 
Point A unit of weight measure equal to 1/100 of a carat. A 1/2 carat diamond weighs 50 points, etc.
 
Polish The overall uniformity of the polish of a diamond. Graded from poor to excellent, it is based on the final finish applied to the facets and facet junctions by the cutter.
 
SI1 

A term used to describe the clarity of the diamond, meaning slight inclusions. 

 
Solitaire A single diamond set in a mounting which shows off the simplicity and elegance of the diamond.
 
Sparkle

Along with life, fire, scintillation, refraction, dispersion, a word used to describe the brilliance of a diamond.

 
Symmetry The overall uniformity of the cut of a diamond. Graded from poor to excellent, it is based on the diamond's proportions and the relation of one facet to another.
 
Table

The top and largest facet of a diamond, it is where much of its light both enters and exits the diamond .

 
Table %

A measurement which relates the width of the table divided by the total top surface of area .

 
VS1

A term used to describe the clarity of the diamond, meaning very slight inclusions. There are two grades in the VS range: VS1 and VS2. The imperfections in VS stones can be quite difficult to find even with the aid of 10 power magnification.

 
VVS1

A term used to describe the clarity of the diamond, meaning very, very slight inclusions. There are two grades in the VVS range: VVS1 and VVS2. Imperfections in VVS stones should be extremely difficult to find even with the aid of 10 power magnification.

 

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